and, of course, i have the energy saver lightbulbs. to change an entire house to energy saver lightbulbs saves as much electricity -- or i should say saves as much carbon in a year as moving to a walkable neighborhood saves in a week. so the whole what can i buy to make myself more sustainable is the wrong discussion. it should be where can i live and how can i live to contribute less. and the answer, again, is the city. this is fundamentally the opposite of the american ethos, you know? from jefferson on. cities are essential to the health and freedom of man. if we continue to pile upon ourselves in cities as they do in europe, we shall take to eating one another as they do there. [laughter] that was jefferson. and that just continued and continued. and it made sense back in the 1700s when we had the whole country to spread out on. but that's not the case now. so it's a longer discussion. all three of these are a longer discussion. but they're all national crises. we have a national economic crisis which is only going to get tougher,